Fig. 1.

Dependence on Q of the probability density function P(Q,T) for nine values of T. At high T, P(Q,T) is bimodal with peaks at high and low values of Q. The magnitude of the high Q value peak grows as it shifts toward the larger values of Q upon decreasing temperature whereas the magnitude of the low Q value peak decreases and, at sufficiently low temperatures, P(Q,T) becomes unimodal. Analogous plots are shown for TIP4P and TIP5P models, respectively, in refs. 13 and 17. Error bars are shown in green.